docs: def set_simple_fault_geometry_3D(w, src):
      """
      Builds a 3D polygon from a node instance
      """
      assert "simpleFaultSource" in src.tag
      geometry_node = src.nodes[get_taglist(src).index("simpleFaultGeometry")]
      fault_attrs = parse_simple_fault_geometry(geometry_node)
      build_polygon_from_fault_attrs(w, fault_attrs)